Description:
A preliminary investigation of the geothermal resource
potential of the San Pedro River valley was undertaken the
latter part of 1980. The area of investigation is situated
in Pinal, Pima and Cochise counties, Arizona. It extends
from the town of Mammoth, Pinal County, south-southeast
along the river valley to just north of the Johnny Lyon
Hills, an area comprising 2331 km2 (900 mi 2).
With the exception of mining and smelting activities
in the Mammoth-San Manuel area, the primary business in
the valley is agriculture, cattle ranching and forage crops.
The majority of the irrigation, livestock, and domestic
wells are along the bed of the San Pedro River, an ephemeral
stream that flows northward from its headwaters in Mexico.
The wells generally vary in depth from 24 m (80 ft) to
36 m (120 ft) and essentially produce from the subsurface
.